Keyless Entry Problem

Have an '02 Sonata with keyless. Went for gas today (wife and I),
we both got out of the car and shut the doors. The car locked by
itself with the keys in the ignition. Had to have the neighbor come

with the spare set. The remote (spare) would not work, the spare key
did. Once we got in, everything worked okay the spare and the regular
remote.
Once before the car locked by itself and the alarm went off. The
wife had the keys at the time and this was no problem. My guess is
there must be some kind of a control module that has a problem. Can
anyone shed some light on this, I'd like to get it fixed if it's not
a fortune. As this is the wife's car and she doesn't like these kind
of surprises.
Thank you all,
Bob

I have an 07 Sonata that will occasionally lock itself after exiting. The
dealer says he can't find anything wrong with it. What I now suspect from
observations is that its not completely unlocking when I open the door. What
I have done is too hide an extra key in a magnetic box on the car.

With my former Hyundai Sonata I had the same problem; in my opinion it can
occur a faux contact slamming the door in hot days, it's not related to
remote control.
From that day I always take with me the keys exiting from car ;-)

Don't know why it locked, but I may be able to answer a few questions about
some
of the other things you've referenced in your post.
-- Doors will not lock with key in ignition and door open.
-- Remotes will not operate while key is in ignition.
-- If car is unlocked with remote and a door is not opened within 30
seconds,
the computer presumes it was an inadvertent unlock signal, and
then locks the
vehicle and arms the security system.
Some automobiles have alarms on them that automatically lock and arm the
car
after the key is off a certain period of time. Since we typically
leave the
keys in the car while it's in the shop, we always roll down a
window to prevent
being unintentionally locked out of the car.
--
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